What kind of pearls do I have and who made them?

I purchased these pearls from an online auction and was wondering if you could help me figure out what kind of pearls they are and if you recognize the makers mark. The pearls are gritty when rubbed gently against my teeth. They range in size of 3mm-8mm. The Hallmark on the clasp is 585 (I know that means 14k) and then what I